This is going to be tricky, but I'd like to give it a shot.
Chaetostoma, in general, have higher-set and closer-set eyes than the fish in your (ad) photos. I wish they had provided a photo of the mouth because that would be the most telling feature. Chaetostoma have very wide mouths compared to other Loricariidae. It's remarkable.

The top view in your photos reminds me much more of a Panaque or even Peckoltia species. But which one? (Rhetorical question.)

I can see some vague banding, especially in the tail and there appears to be a network of lines on the face.